Improvement in caps for glass syringes



P'. F. SLAVIN.

Caps for Glass Syringes.

Patented April 28, 1874.

LWITNESSES W/ ATTUBNEYS.

UNITED STATES PATENT QFFIOE.

PATRICK F. SLAVIN, OF NEW YORK, N. Y.

IMPROVEMENT IN CAPS FOR GLASS SYRINGES.

Specification forming part of Letters Patent No. 150,262, dated April28, 1874; application filed April 4, 1874.

To all whom it may concern:

Be it known that I, PATRICK F. SLAVIN, of the city, county, and State ofNew York, have invented a new and useful Improvement in Gap for GlassSyringes, of which the following is a specification:

The figure is a side view, partly in section, of a glass syringe towhich my improved cap has been applied, the cap being also shown insection.

My invention has for its object to furnish an improved cap for glasssyringes, which shall be so constructed that it cannot be pushed intothe barrel of the syringe, and which shall at the same time beconvenient in use. The invention consists of the cap formed of the cork,and the metallic tube having a flange formed upon its upper end, the endof which is spun over to clasp the upper end of the said cork and form alip, and having the lower end spun outward to overlap the inner end ofthe said cork, as hereinafter'fully described.

A represents the barrel, and B the pistonrod of the syringe, about theconstruction of which there is nothing new. 0 is a cork of such a sizeas to fit into the barrel A, and which has ahole formed longitudinallythrough its center for the passage of the piston-rod B. D is a tube,which is passed through the hole through the cork O, and which is madeof such a size that the piston-rod B can work in it freely. Upon theupper end of the tube D is formed a flange of such a size that its edgemay project a little beyond the sides of the cork. The edge of the topflange of the tube D is spun over, so as to be turned against and claspthe upper part of the cork O, as shown in the figure. The lower end ofthe tube is spun out, so as to overlap the inner end of the cork (l, asshown in the figure.

By this construction the parts 0 D of the cap will be securely andpermanently fastened together in such a way as not to interfere with theproper operation of the cork 0, while the lip formed at its upper endrests against the edge of the barrel A, and prevents the possibility ofthe cap beingpushed into the barrel A, which, when it happens, allowsthe piston to strike against the shoulder of the syringe and break it.The flanged or spun-out lower end of the tube D, which overlaps theinner end of the cork G, prevents the possibility of the said tube beingdrawn out of the cork 0, should said cork be compressedby beingforcedinto a syringe a little too small.

Having thus described my invention, I claim as new and desire to secureby Letters Patent- The syringe-cap G D, formed of the cork O and themetallic tube D, having afiange formed upon its upper end, the edge ofwhich is spun over to clasp the upper end of the said cork (J and form alip, and having its lower end spun outward to overlap the inner end ofthe said cork O, substantially as herein shown and described.

PATRICK F. SLAVIN. Witnesses:

JAMES T. GRAHAM, T. B. Mosnnn.

